SPD vs. fractional distillation under vacuum


So we have the normal SPD setup, but why can you not use a generic fractional distillation setup and take the vacuum down to SPD levels from the cow?

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I appreciate the concission.


Try it. Report back.

And/Or ask yourself why SPD was invented in the first place?


I understand the efficiency but with a taller vigreux the product coming over would be more pure and it would be easier to see transitions between fractions. Is this correct or am i wrong?


If that is what you seek then check out the spinning band fractional distillation units made by B/R Instruments. There are several B/R users here including myself.